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Microscope images of: (a, c, e) horizontal lines printed with a LaserJet printer (HP 1320); and (b, d, f) the corresponding PDMS replica of the printed lines. The printed features are reproduction of CAD (FreeHand, v. 10) images with line thickness: (a, b) 200 μm; (c, d) 100 μm; and (e, f) 20 μm. The scale bars correspond to 100 μm
